Chuck



D. L; BISSET.

. CHUCK.

Y APPLICATION FItEDYMNfHQ 1920.

PatendSept. 27, 1921.

j a subject lofthe '.Kingof .Great Britain, and

UMTED `sTA'rE'sf ravin :LOGAN Bissiazfr,l or MoitTRriAr/i. QUEBEC, emana i ToaZ fwwm t may concern.'

. Be it known thatl, DAVID Loc-AN .Bissau residing at 75 Columbia avenue, vvinthecity and District of Montreal, in the Province of Quebec, :in :the 412),.o1ninion of Canada, have invented a new and useful Chuck, of which the Vfollowing is the specification.

The invention relates to chucks as described in the present specification and illus-V ping jaws,.whereby the force employed in boring the work adds to the security of the fastening.

The objects of the invention are to eiliciently hold the boring tool in its placedur-l ing boringoperations;v to facilitate the adjustment of t ie jaws; to insure simplicity 1n the construction and materially improve the conditions in regard to repairs and replacements; and generally to provide safetyV and durability in the operation of boring tools.

In the drawings, Figure 1 is a longitudinal sectional view, showing the jaw Vhousing and jaws with a drill inserted therein. n

Fig. 2 is a cross sectional view on the line A-Ain Fig. 1. v

vFig. 3 is a cross sectional view` on the line B--B in Fig. 1.

Fig. 4 is a cross sectional view on the line C-C in Fig. 1. Y

Fig. 5 is a detail of the jaw expansion spring. f

Fig. 6 is a perspective `detail of the adjusting head.

Fig. 7 is a perspective detail of the outer adjusting sleeve.

Fig. 8 is a perspective detail of the jaws.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, the body 1 of the chuck forms part with the shank 2 or any other piece for securingit to the machine, such as a socket or the like. The annular rib 3 is formed on the body 1, adjacent to the inner shank end, and the central tapered jaw recess 4c extends inwardly from the outer end. The threadedfhole 5 is made in the wall of said recess and the squared shoulder of the annular rib 3 forms a retaining ring for the outer adjusting sleeve 6, the latter having an inturned flanged end 7 over said shoulder.

Specification of Letters Patent.

Application meayaanuary 17.1920. lSeriana 352,157.

CHUCK.

Patented Sept. 27, '1921.

The sleeve`6 beyond-'the rib 3 lis internally. i

Athreaded at Sto itsjextremityg'and itsperph- Ver k9 .is .knurled ie aws 10, 1.1'fand12form three lparts vand `together taper from the center to vthe -endsindoublefrone 'shape having at the--in nerjends the flanges 13 made to receive the flat end of the shank The jaws 10, 11 and 12 recess 14 intermediate. of and slightly beyond the toward the outer end, spring 15 is inserted in t e jaws are assembled in the recess 4.

The chuck head 16 is formed with the tapered jaw opening 17 and ythe cylindrical extension 18 externally threaded and is screwed into the adjusting sleeve 6, longitudinally slotted at 19 to receive the screw 2O rwhich fastens in the body 1 and in contact withV the walls of the slot 19 keeps both the extension head and adjusting sleeve from rotating in respect to the body.

In the operation of this chuck, the double each have-a spring the length thereof center of the jaws vand the expansion cone jaws are assembled in the jaw recess of the body 1 and in-their taper conform to the shape of said jaw recess. The chuck head 16 is closely fitted to the outer cone portion of the jaw and the jaw opening in said chuck head corresponds to the taper of said outer portion. The screw 20 is screw threaded into the hole 5 through the slot 19, therefore the body and the chuck head are secure from rotation in relation to one another and the adjusting sleeve, that is to say, all must rotate together.

The adjusting sleeve 6 is then screwed on to the chuck head 16 and the jaw opening 17 is adjusted to the drill or other boring tool, which may be inserted.

' The tool is then ready for use and the shank inserted in the machine, or if it is a socket a spindle from the machine is inserted in the socket, for that is no part of the invention, and as soon as this is done and the tool applied to the work, it will be seen thatV the greater the force employed, the closer the jaws wlll grip the drill, up to the limit of their gripping properties, therefore the drill or other borin or finishing tool will.

said recesses whenv parting from the spirit of the invention, and

so long as these changes are Within'the scope of the claim for novelty following, the protection accorded shall not be invalidated.

Vhat I claim is In a chuck, in combination, a jaw socket member having a tapered recess inthe cylin drical body portion, and an annular flange adjacent to the inner end of said body, a

plurality "of jaw members togetherhtor1ning-vv a double cone shaped shankl holder tapering from the central portion to the ends, oneV taperedportion beinginserted in Said jaW recess and the other projecting outwardly p Wardly proJectin barrel extension s ida ly an v`therefrom and spring-held apart, a chuck head .forming *aI jawfcontracting member, havinga tapered mouth engaging said outta ered ortion, and a non-rotatably arran ed on said body and externally threa ed, andan operating sleeve linternally threaded and engaging saidbarrel 'extension of the chuck head and rotatable 0n Said annular flange. Y A

v Signedat the Vcity ofMontreal, Province of Quebec, Dominion of Canada, thisylOth dayof January, 1920.l E i Y DAVID LOGAN BISSET; 

